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A Fast Safety Message Transmission Mechanism for Heterogeneous Vehicular Networks |
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PP: 219-228 |
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Author(s) |
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Yu-Hsin Cheng,
Shang-Juh Kao,
Fu-Min Chang,
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Abstract |
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| Safety messages initiated by accident vehicle in a vehicular network may be for accident rescue, accident notification, and
diversion notification. Traditional vehicular networks adopt a vehicle-to-vehicle (V2V) method to transmit safety messages. Under this
mechanism, safety messages may be impeded when there are too many vehicles near the accident vehicle or there is no vehicle close
enough at the rear of the accident vehicle to detect a safety message, preventing the accident and diversion notifications from being
effectively transmitted. In addition, existing mechanisms cannot effectively convey accident rescue messages. This study combines
vehicle-to-vehicle and vehicle-to-infrastructure (V2I) network transmission methods, and proposes a fast safety message transmission
(FSMT) mechanism. In addition to making use of wider transmission range characteristics of V2I networks to achieve accident rescue,
this mechanism reduces safety message transmission time through the help of V2I when it determined that the situation is not conducive
to V2V transmission. Simulation results reveal that vehicles within and outside V2V signal range can on average receive safetymessages
0.86 second and 0.85 minute earlier respectively by adopting thismethod. It also reduces redundant messages and accomplishes accident
rescue notification. |
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